A speaker suspended high in the air, away from other objects, emits one spherical wave with total energy 5 J. Assume the waves travel at the speed of sound in air: 343 m/s. Draw the wave 2 seconds and 5 seconds after it was emitted. Label the total energy at each of these times. Label the energy per unit area for each of these times.I would like to know how should I approach this problem when it comes to sound waves and how do I apply total energy in this problem?

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Asked Oct 27, 2019
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A speaker suspended high in the air, away from other objects, emits one spherical wave with total energy 5 J. Assume the waves travel at the speed of sound in air: 343 m/s. Draw the wave 2 seconds and 5 seconds after it was emitted. Label the total energy at each of these times. Label the energy per unit area for each of these times.

I would like to know how should I approach this problem when it comes to sound waves and how do I apply total energy in this problem?

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Expert Answer

Step 1
From the law of Condervatiom af enegy
one Can say hat the energy of wane E=5J
emains thesam, but as TE more outaref
Ppom the o3igin, the suxface aseq 6f ware
increand. The Speed and slape of wam
vemain Constant dusing th movement.
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From the law of Condervatiom af enegy one Can say hat the energy of wane E=5J emains thesam, but as TE more outaref Ppom the o3igin, the suxface aseq 6f ware increand. The Speed and slape of wam vemain Constant dusing th movement.

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Step 2
As the oo move foward ?Eadfus
will increaned at contantspeed U-3Y3M/s
At t25, 2adfus of sphese, ut
e
(343 m/s) (2s)686m
At t5sadfus of sphese, = ut
(43 mls)(5s)
help_outline

Image Transcriptionclose

As the oo move foward ?Eadfus will increaned at contantspeed U-3Y3M/s At t25, 2adfus of sphese, ut e (343 m/s) (2s)686m At t5sadfus of sphese, = ut (43 mls)(5s)

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Step 3
SPnce,enexy constant, and only Auaface
area is changing es the ware moves
outward
At t2s Enery per unitaseq,
5J
E,-
чт о
3.45KI6 m2
5J
E,
r(636 m) 2
help_outline

Image Transcriptionclose

SPnce,enexy constant, and only Auaface area is changing es the ware moves outward At t2s Enery per unitaseq, 5J E,- чт о 3.45KI6 m2 5J E, r(636 m) 2

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